If possible, look for part-time work (during evenings, weekends, and summer breaks) in a shipyard or on board a ship or sea-going vessel of any kind. You will learn about ship parts, worker roles, chain of command, and ship repair, as well as gaining experience on the sea, which will help you to know for sure that a career as a captain is ideal for you. If you do not live near the sea or large lakes, try to find summer work on board a ship.